20981810

素因数分解:

$2^1\times 5^1\times {\mathrm{239}}^1\times {\mathrm{8779}}^1$

素因数の和:9025

約数の個数: 16

約数和(自身を含む): 37929600

約数和(自身を除く): 16947790

約数列:

[1, 2, 5, 10, 239, 478, 1195, 2390, 8779, 17558, 43895, 87790, 2098181, 4196362, 10490905, 20981810]

約数ペア:

[(1, 20981810), (2, 10490905), (5, 4196362), (10, 2098181), (239, 87790), (478, 43895), (1195, 17558), (2390, 8779)]